Method and apparatus for transmitting uplink and downlink data in TDD system

ABSTRACT

A method and an apparatus for transmitting uplink/downlink data on time division duplexing (TDD) carriers are provided. The method includes transmitting to a base station in a primary cell (PCell) and a secondary cell (SCell), a TDD uplink (UL)/downlink (DL) configuration of the PCell having a DL subframe super-set or UL subset that are common in the SCell and the PCell and a TDD UL-DL configuration differing from each other, receiving data at a first subframe in the SCell, and transmitting, when a UL subframe set of the SCell is a subset of a UL subframe of the PCell, a feedback corresponding to the data at a subframe predefined in association with the first subframe in the PCell according to the TDD UL-DL configuration of the SCell. The method supports both the self-scheduling and cross-carrier scheduling of the UE using carriers of different TDD configurations.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a continuation application of prior application Ser.No. 14/738,213, filed on Jun. 12, 2015 in the U.S. Patent and TrademarkOffice, which issues as U.S. Pat. No. 9,722,747 on Aug. 1, 2017 which isa continuation application of a prior application Ser. No. 13/767,447,filed on Feb. 14, 2013 in the U.S. Patent and Trademark Office, whichhas issued as U.S. Pat. No. 9,060,357 on Jun. 16, 2015 and claimed thebenefit under 35 U.S.C. § 119(e) of a U.S. Provisional application filedon Feb. 14, 2012 in the U.S. Patent and Trademark Office and assignedSer. No. 61/598,466, of a U.S. Provisional application filed on Feb. 27,2012 in the U.S. Patent and Trademark Office and assigned Ser. No.61/603,459, and of a U.S. Provisional application filed on Mar. 7, 2012in the U.S. Patent and Trademark Office and assigned Ser. No.61/607,694, the entire disclosure of each of which is herebyincorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a method and an apparatus fortransmitting uplink/downlink data on Time Division Duplexing (TDD)carriers. More particularly, the present invention relates to anapparatus for supporting self-scheduling and cross-carrier scheduling ofa User Equipment (UE) on carriers with different TDD configurations soas to transmit acknowledgement channels simultaneously regardless of thescheduled carrier.

2. Description of the Related Art

Long Term Evolution (LTE) is an Orthogonal Frequency Division MultipleAccess (OFDMA)-based communication standard designed to support bothFrequency Division Duplexing (FDD) and TDD. LTE release 8 has beendesigned to support FDD and TDD on a single carrier and evolved to LTErelease 10 which supports both the FDD and TDD. However, it restrictsthe TDD operation only to the case where the uplink-downlinkconfiguration should be the same across the carriers. In release 11, thework is expected to continue on supporting TDD operation across thecarriers with different uplink-downlink configurations.

Table 1 shows the TDD configurations supported in an LTE Rel. 8 system.

TABLE 1 Uplink-downlink Downlink-to-Uplink Subframe number configurationSwitch-point periodicity 0 1 2 3 4 5 6 7 8 9 0 5 ms D S U U U D S U U U1 5 ms D S U U D D S U U D 2 5 ms D S U D D D S U D D 3 10 ms  D S U U UD D D D D 4 10 ms  D S U U D D D D D D 5 10 ms  D S U D D D D D D D 6 5ms D S U U U D S U U D

As shown in Table 1, a total of 7 configurations are supported with 10subframes in which D denotes a subframe reserved for downlinktransmission, S denotes a special subframe capable of supporting boththe downlink and the uplink transmission and having a guard period forswitching between uplink and downlink transmission, and U denotes asubframe reserved for uplink transmission. Since the TDD configurationsdiffer from each other in position and number of subframes for uplinktransmission, the number of Hybrid Automatic Repeat request (HARQ)processes and transmission timings available for UEs vary depending onthe TDD configuration. In order to support this, the Physical DownlinkShared Channel (PDSCH)-HARQ-ACKnowledgement (ACK) timing relationship isdefined per TDD configuration in downlink transmission, two timings,scheduling-Physical Uplink Shared Channel (PUSCH) timing for schedulinginformation transmission and PUSCH-HARQ-ACK timing for data transmissionand evolved Node B's (eNB's) ACK channel transmission, are defined inuplink transmission.

1) PDSCH to HARQ-ACK Timing

Table 2 shows timing relationships of TDD configurations.

TABLE 2 UpLink-DownLink (UL-DL) Subframe n Configuration 0 1 2 3 4 5 6 78 9 0 — — 6 — 4 — — 6 — 4 1 — — 7, 6 4 — — — 7, 6 4 — 2 — — 8, 7, 4, 6 —— — — 8, 7, — — 4, 6 3 — — 7, 6, 11 6, 5 5, — — — — — 4 4 — — 12, 8, 7,11 6, 5, — — — — — — 4, 7 5 — — 13, 12, 9, 8, 7, 5, 4, — — — — — — — 11,6 6 — — 7 7 5 — — 7 7 —

In Table 2, the value 6 for subframe 2 column of configuration 0indicates that the UE's ACK channel corresponding to the eNB's PDSCHtransmission before 6 subframes is transmitted at the 2nd subframe.Table 2 shows the relative time of PDSCH transmission to current uplinkACK channel.

2) Scheduling to PUSCH Timing

Table 3 shows the uplink data channel transmission timing relationshipfor scheduling of TDD configurations.

TABLE 3 TDD UL/DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 04 6 4 6 1 6 4 6 4 2 4 4 3 4 4 4 4 4 4 5 4 6 7 7 7 7 5

Table 3 shows the subframe interval of PUSCH transmitted based on thescheduling control channel received at the n^(th) subframe of downlinktransmission. For example, if the uplink control channel is received atthe 0^(th) subframe in the configuration 3, this means that the UEtransmits uplink data channel after 4 subframes.

3) PUSCH to HARQ-ACK Timing

Table 4 shows the relationship between PUSCH transmission and eNB's ACKchannel transmission timings.

TABLE 4 TDD UL/DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 07 4 7 4 1 4 6 4 6 2 6 6 3 6 6 6 4 6 6 5 6 6 6 4 7 4 6

Table 4 shows the ACK channel transmission timing to the UE's PUSCHtransmission in which, if the eNB has transmitted the ACK channel at the0^(th) downlink subframe in the configuration 3, this means that the ACKchannel is transmitted for the PUSCH transmitted before 6 subframes.

In the downlink HARQ process of an LTE system, which is as asynchronoussystem, if the erroneous downlink data channel can be retransmitted at acertain timing, erroneous uplink data channel has to be transmitted at apredefined timing in a synchronous manner. This can be a Round Trip Time(RTT) having a value that varies according to the TDD configuration, andif the sum of values at the same position in Tables 3 and 4 is 10, thismeans that RTT is 10 msec, and otherwise, another RTT can be used.Accordingly, the configurations 1, 2, 3, 4, and 5 are configurationsthat guarantee the RTT of 10 msec, and the configurations 0 and 6 arethe configurations guaranteeing another RTT.

In Release 10, the carrier aggregation technique for using multiplecarriers is adopted. Carrier aggregation is a technique in which a UEreceives data on multiple carriers. In order to discriminate amongcarriers, the UE is assigned primary and secondary cells that arereferred to as a PCell and an SCell, respectively. The UE can beassigned one downlink and uplink PCell and multiple downlink and uplinkSCells. In order to support data communication on multiple carriers,there are two scheduling schemes, i.e., self-scheduling andcross-carrier scheduling.

1) Self Scheduling

The self-scheduling is a method for transmitting, by the eNB, differentcontrol channels to the UEs on corresponding carriers. The downlinkcontrol channel is transmitted at a control channel region of eachcarrier separately while the data channel is transmitted through thesame carrier on which the data channel has been received. However, theACK channel of the UE is transmitted only in the PCell to minimize theuplink interference and transmit the ACK channels as multiplexed. Intransmitting downlink ACK channel, the ACK channel is transmitted on thecarrier where the control channel for downlink scheduling has beentransmitted.

2) Cross-Carrier Scheduling

The cross-carrier scheduling is a method for receiving the controlchannel on a single carrier and for transmitting data channel onmultiple carriers. The data channel for scheduling is transmittedthrough the PCell, and the data channel can be transmitted on allchannels while the ACK channels of both the UE and the eNB aretransmitted through the PCell.

In Rel. 10, since the carrier aggregation is supported only for the sameTDD configuration, the downlink and uplink transmission timings areidentical across carriers and if the PCell has uplink and the SCell hasuplink and vice versa such that it is possible to support theabove-described self-scheduling and cross-carrier scheduling. In thecase of aggregating carriers with different TDD configurations, thecarrier aggregation can be supported depending on the TDDconfigurations, the supportability can be determined throughsuper-set/subset relationship.

FIG. 1 illustrates a TDD configuration with a super-set/subsetrelationship according to the related art, and FIG. 2 illustrates a TDDconfiguration without a super-set/subset relationship according to therelated art.

Referring to FIG. 1, in a case of part 101 and in a case of part 103,there are UL subset and DL subset relationships among the TDDconfigurations 0, 6, 1, and 2. For example, the configuration 0 is a ULsuper-set of the configurations 6, 1, and 2, and the configuration 2 isa UL subset and DL super-set of the configurations 1, 6, and 0simultaneously.

Referring to FIG. 2, In a case of part 201, there are nosuper-set/subset relationships between TDD configurations 1 and 3. In acase of part 203, there is no super-set/subset relationship between theTDD configurations 2 and 4. In addition, in a case of part 205, there isno super-set/subset relationship between the TDD configurations 3 and 2.For example, these three combinations are not fulfilling both the DLsubset and the UL subset.

Such combinations make it possible to determine whether thecross-carrier scheduling and self-scheduling can be supported dependingon the type of combination. For example, if the DL of the PCell is thesuper-set of the SCell, the eNB supports the cross-carrier scheduling inDLs of all the SCells, and if UL super-set is DL at the PCell's ULtiming, it is difficult to schedule the corresponding DL subframe.Accordingly, the self-scheduling or the cross-carrier scheduling definedin Rel. 10 can be applied to the cases of using different TDDconfigurations in Rel. 11 without modification in the following cases.

-   -   1) The timing of the PCell follows HARQ process timing of uplink        of the PCell regardless of self-scheduling and cross-carrier        scheduling.    -   2) In a case of self-scheduling, the uplink HARQ process timing        of the SCell follows the SCell timing regardless of a        super-set/subset relationship.    -   3) In a case of cross-carrier scheduling, the downlink HARQ        process timing of the SCell follows the timing of the PCell if        the SCell is DL subset of the PCell.    -   4) In a case of cross-carrier scheduling, the uplink HARQ        processing timing of the SCell follows the timing of the PCell        if the SCell is the UL subset of the PCell and the UL RTT of the        PCell is 10 msec.

In the above 4 cases, the scheduling can be supported withoutmodification, but for other cases of combinations, modification may beimperative.

Therefore, a need exists for an apparatus for supporting self-schedulingand cross-carrier scheduling of a UE on carriers with different TDDconfigurations so as to transmit acknowledgement channels simultaneouslyregardless of the scheduled carrier.

The above information is presented as background information only toassist with an understanding of the present disclosure. No determinationhas been made, and no assertion is made, as to whether any of the abovemight be applicable as prior art with regard to the present invention.

SUMMARY OF THE INVENTION

Aspects of the present invention are to address at least theabove-mentioned problems and/or disadvantages and to provide at leastthe advantages described below. Accordingly, an aspect of the presentinvention is to provide a method and an apparatus for supportingself-scheduling and cross-carrier scheduling of a User Equipment (UE) oncarriers with different Time Division Duplex (TDD) configurations so asto transmit acknowledgement channels simultaneously regardless of thescheduled carrier.

The objects of the present invention are not limited to the aforesaid,and other objects not described herein will be clearly understood bythose skilled in the art from the descriptions below.

In accordance with an aspect of the present invention, a feedback methodof a terminal in a TDD system is provided. The method includesestablishing connections with a base station in a Primary Cell (PCell)and a Secondary Cell (SCell), a TDD Uplink-Downlink (UL-DL)configuration of the PCell and a TDD UL-DL configuration of the SCelldiffering from each other, receiving data at a first subframe in theSCell, and transmitting, when a UL subframe set of the SCell is a subsetof a UL subframe of the PCell, a feedback corresponding to the data at asubframe predefined in association with the first subframe in the PCellaccording to the TDD UL-DL configuration of the SCell.

In accordance with another aspect of the present invention, a feedbackreception method of a base station in a TDD system is provided. Themethod includes establishing connections with a terminal in a PCell andan SCell, a TDD UL-DL configuration of the PCell and a TDD UL-DLconfiguration of the SCell differing from each other, transmitting dataat a first subframe in the Scell, and receiving, when a UL subframe setof the SCell is a subset of a UL subframe of the PCell, a feedbackcorresponding to the data at a subframe predefined in association withthe first subframe in the PCell according to the TDD UL-DL configurationof the SCell.

In accordance with another aspect of the present invention, a terminalfor transmitting a feedback in a TDD system is provided. The terminalincludes a transceiver for transmitting to a base station in a PCell andan SCell, a TDD UL-DL configuration of the PCell and a TDD UL-DLconfiguration of the SCell differing from each other, for receiving dataat a first subframe in the SCell, and for transmitting, when a ULsubframe set of the SCell is a subset of a UL subframe of the PCell, afeedback corresponding to the data at a subframe predefined inassociation with the first subframe in the PCell according to the TDDUL-DL configuration of the SCell.

In accordance with another aspect of the present invention, a basestation for receiving a feedback in a TDD system is provided. The basestation includes a transceiver for establishing connections with aterminal in a PCell and an SCell, a TDD UL-DL configuration of the PCelland a TDD UL-DL configuration of the SCell differing from each other,for transmitting data at a first subframe in the SCell, and forreceiving, when a UL subframe set of the SCell is a subset of a ULsubframe of the PCell, a feedback corresponding to the data at asubframe predefined in association with the first subframe in the PCellaccording to the TDD UL-DL configuration of the SCell.

In accordance with another aspect of the present invention, a feedbackmethod of a terminal in a TDD system is provided. The method includesestablishing connections with a base station in a PCell and an SCell, aTDD UL-DL configuration of the PCell and a TDD UL-DL configuration ofthe SCell differing from each other, receiving data at a first subframein the S cell, and transmitting, when a UL subframe set of the SCell isa subset of a UL subframe of the PCell, a feedback corresponding to thedata at a subframe predefined in association with the first subframe inthe PCell according to the TDD UL-DL configuration of the PCell, whereinno SCell downlink transmission is scheduled in the subframe which isdownlink in the TDD UL-DL configuration of the SCell and but notdownlink in the TDD UL-DL configuration of the PCell.

In accordance with another aspect of the present invention, a feedbackreception method of a base station in a TDD system is provided. Themethod includes establishing connections with a terminal in a PCell andan SCell, a TDD UL-DL configuration of the PCell and a TDD UL-DLconfiguration of the SCell differing from each other, transmitting dataat a first subframe in the S cell, and receiving, when a UL subframe setof the SCell is a subset of a UL subframe of the PCell, a feedbackcorresponding to the data at a subframe predefined in association withthe first subframe in the PCell according to the TDD UL-DL configurationof the PCell, wherein no SCell downlink transmission is scheduled in thesubframe which is downlink in the TDD UL-DL configuration of the SCelland but not downlink in the TDD UL-DL configuration of the PCell.

In accordance with another aspect of the present invention, a terminalfor transmitting a feedback in a TDD system is provided. The terminalincludes a transceiver for transmitting to a base station in a PCell andan SCell, a TDD UL-DL configuration of the PCell and a TDD UL-DLconfiguration of the SCell differing from each other, for receiving dataat a first subframe in the SCell, and for transmitting, when a ULsubframe set of the SCell is a subset of a UL subframe of the PCell, afeedback corresponding to the data at a subframe predefined inassociation with the first subframe in the PCell according to the TDDUL-DL configuration of the PCell, wherein no SCell downlink transmissionis scheduled in the subframe which is downlink in the TDD UL-DLconfiguration of the SCell and but not downlink in the TDD UL-DLconfiguration of the PCell.

In accordance with another aspect of the present invention, a basestation for receiving a feedback in a TDD system is provided. The basestation includes a transceiver for establishing connections with aterminal in a PCell and an SCell, a TDD UL-DL configuration of the PCelland a TDD UL-DL configuration of the SCell differing from each other,for transmitting data at a first subframe in the SCell, and forreceiving, when a UL subframe set of the SCell is a subset of a ULsubframe of the PCell, a feedback corresponding to the data at asubframe predefined in association with the first subframe in the PCellaccording to the TDD UL-DL configuration of the PCell, wherein no SCelldownlink transmission is scheduled in the subframe which is downlink inthe TDD UL-DL configuration of the SCell and but not downlink in the TDDUL-DL configuration of the PCell.

Other aspects, advantages, and salient features of the invention willbecome apparent to those skilled in the art from the following detaileddescription, which, taken in conjunction with the annexed drawings,discloses exemplary embodiments of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of certainexemplary embodiments of the present invention will be more apparentfrom the following description taken in conjunction with theaccompanying drawings, in which:

FIG. 1 illustrates a Time Division Duplex (TDD) configuration with asuper-set/subset relationship according to the related art;

FIG. 2 illustrates a TDD configuration without a super-set/subsetrelationship according to the related art;

FIG. 3 illustrates a Physical Downlink Shared Channel-Hybrid AutomaticRepeat reQuest (PDSCH-HARQ) timing relationship when an UpLink (UL)subframe of a Secondary Cell (SCell) is a subset of a Primary Cell(PCell) according to an exemplary embodiment of the present invention;

FIG. 4 illustrates a PDSCH-HARQ timing relationship through across-carrier scheduling when a UL subframe of an SCell is a subset of aPCell according to a second exemplary embodiment of the presentinvention;

FIG. 5 illustrates a timing relationship between an uplink data channeltransmission of a User Equipment (UE) and an acknowledgement channeltransmission of an evolved Node B (eNB) when a DL subframe of an SCellis a DL subset of a PCell according to a third exemplary embodiment ofthe present invention;

FIG. 6 illustrates an SCell timing relationship between a PDSCH and aUE's acknowledgement channel with self-scheduling when an SCell isneither a DL subset nor a UL subset of a PCell according to a fourthexemplary embodiment of the present invention;

FIG. 7 illustrates a PDSCH-HARQ timing relationship of an SCell withself-scheduling when the SCell is neither a DL subset nor a UL subset ofa PCell according to a fifth exemplary embodiment of the presentinvention;

FIG. 8 illustrates a scheduling-Physical Uplink Shared Channel(PUSCH)-HARQ timing relationship with a cross-carrier scheduling when anSCell is a DL subset but not a UL subset of a PCell according to a sixthexemplary embodiment of the present invention;

FIG. 9 illustrates a PDSCH HARQ timing relationship of an SCell withself-scheduling when the SCell is a UL subset of a PCell according to aseventh exemplary embodiment of the present invention;

FIG. 10 illustrates a UL HARQ for a Round Trip Time (RTT) of 70 msec ina TDD configuration 0 according to an exemplary embodiment of thepresent invention;

FIG. 11 illustrates a scheduling-PUSCH-HARQ timing relationship when anSCell is a UL subset of a PCell and the PCell RTT is not 10 msecaccording to an eighth exemplary embodiment of the present invention;

FIG. 12 illustrates a scheduling-PUSCH-HARQ timing relationship when anSCell is a UL subset of a PCell and the PCell RTT is not 10 msecaccording to the eighth exemplary embodiment of the present invention;

FIG. 13 illustrates an SCell UL HARQ timing relationship with across-carrier scheduling when the SCell is a UL subset of a PCell andthe PCell operates with configuration 6 according to a ninth exemplaryembodiment of the present invention;

FIG. 14 is a flowchart illustrating an eNB procedure according to anexemplary embodiment of the present invention;

FIG. 15 is a flowchart illustrating a UE procedure according to anexemplary embodiment of the present invention;

FIG. 16 is a block diagram illustrating a configuration of an eNBaccording to an exemplary embodiment of the present invention; and

FIG. 17 is a block diagram illustrating a configuration of a UEaccording to an exemplary embodiment of the present invention.

Throughout the drawings, it should be noted that like reference numbersare used to depict the same or similar elements, features, andstructures.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

The following description with reference to the accompanying drawings isprovided to assist in a comprehensive understanding of exemplaryembodiments of the invention as defined by the claims and theirequivalents. It includes various specific details to assist in thatunderstanding but these are to be regarded as merely exemplary.Accordingly, those of ordinary skill in the art will recognize thatvarious changes and modifications of the embodiments described hereincan be made without departing from the scope and spirit of theinvention. In addition, descriptions of well-known functions andconstructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are notlimited to the bibliographical meanings, but, are merely used by theinventor to enable a clear and consistent understanding of theinvention. Accordingly, it should be apparent to those skilled in theart that the following description of exemplary embodiments of thepresent invention is provided for illustration purpose only and not forthe purpose of limiting the invention as defined by the appended claimsand their equivalents.

It is to be understood that the singular forms “a,” “an,” and “the”include plural referents unless the context clearly dictates otherwise.Thus, for example, reference to “a component surface” includes referenceto one or more of such surfaces.

By the term “substantially” it is meant that the recited characteristic,parameter, or value need not be achieved exactly, but that deviations orvariations, including for example, tolerances, measurement error,measurement accuracy limitations and other factors known to those ofskill in the art, may occur in amounts that do not preclude the effectthe characteristic was intended to provide.

Exemplary embodiments of the present invention relate to a method and anapparatus for supporting self-scheduling and cross-carrier scheduling ofa User Equipment (UE) on carriers with different Time Division Duplex(TDD) configurations so as to transmit acknowledgement channelssimultaneously regardless of the scheduled carrier.

FIGS. 3 through 17, discussed below, and the various exemplaryembodiments used to describe the principles of the present disclosure inthis patent document are by way of illustration only and should not beconstrued in any way that would limit the scope of the disclosure. Thoseskilled in the art will understand that the principles of the presentdisclosure may be implemented in any suitably arranged communicationssystem. The terms used to describe various embodiments are exemplary. Itshould be understood that these are provided to merely aid theunderstanding of the description, and that their use and definitions inno way limit the scope of the invention. Terms first, second, and thelike are used to differentiate between objects having the sameterminology and are in no way intended to represent a chronologicalorder, unless where explicitly stated otherwise. A set is defined as anon-empty set including at least one element.

Descriptions of exemplary methods for supporting different TDDconfigurations are provided below.

1) First Exemplary Embodiment

The first exemplary embodiment relates to a Physical Downlink SharedChannel-Hybrid Automatic Repeat reQuest (PDSCH-HARQ) timing when aSecondary Cell (SCell) is an UpLink (UL) subset of a Primary Cell(PCell) (PDSCH-HARQ timing of self-scheduling of the SCell, if the SCellis the UL subset of the PCell).

FIG. 3 illustrates a PDSCH-HARQ timing relationship when a UL subframeof an SCell is a subset of a PCell according to an exemplary embodimentof the present invention.

Referring to FIG. 3, when the UL subframe of the SCell is a subset ofthe PCell, the PDSCH HARQ timing follows the SCell timing.

If the UL subframe of the SCell is the subset of the UL subframe of thePCell, the uplink ACKnowledgement (ACK) channel corresponding to thedownlink data channel of the SCell occurs in the PCell, as shown in part301, and at this time, it follows the timing of the PCell. Here, it isimpossible to transmit the 4th subframe, although the data channel istransmitted through self-scheduling in the SCell, because there is noACK channel timing. However, the UL transmission is possible in thePCell due to the UL subset relationship following the timing of theSCell. Accordingly, the first exemplary embodiment proposes thetechnique for guaranteeing the ACK channel transmission of the UE in thePCell when the UL subframe of the SCell is the subset of the PCell andfollowing the timing of the SCell for guaranteeing the PDSCHtransmission in all DownLink (DL) subframes of the SCell. The abovedescribed method can be applied to the SCell timing throughcross-carrier scheduling in the same manner, as shown in part 303.

2) Second Exemplary Embodiment

The second exemplary embodiment relates to PDSCH-HARQ timing throughcross-carrier scheduling when the UL subframe of the SCell is the subsetof the PCell (PDSCH-HARQ timing of cross-carrier scheduling of theSCell, if the SCell is the UL subset of the PCell).

FIG. 4 illustrates a PDSCH-HARQ timing relationship through across-carrier scheduling when a UL subframe of an SCell is a subset of aPCell according to a second exemplary embodiment of the presentinvention.

Referring to FIG. 4, if the UL subframe of the SCell is the UL subset ofthe PCell, if the cross-carrier scheduling is supported, if the DLsubframe and special subframe of the SCell are aligned with the DLsubframe/special subframe of the PCell, as shown in part, the HARQtiming of the corresponding UL follows the PCell timing. In contrast, ifthe DL subframe and special subframe of the SCell are not aligned withthe DL subframe/special subframe of the PCell, as shown in part 403,cross-carrier scheduling is not supported because there is no PCelltiming. In this method, since the PCell has more UL subframes, it isadvantageous to use the Physical Uplink Control Channel (PUCCH) resourcein a distributed way and follow the SCell timing. In a case of using theSCell timing, the control channel for the SCell is not transmitted insome UL subframes of the PCell, resulting in unfairness of resource.Since the non-aligned DL subframe has no PCell timing and UL resource,it is possible to avoid HARQ timing confusion through this and reducethe complexity without defining new timing.

3) Third Exemplary Embodiment

The third exemplary embodiment relates to the UE's uplink datatransmission corresponding to the control channel transmission and anevolved Node B's (eNB's) ACK channel transmission timings when the DLsubframe of the SCell is the DL subset of the PCell (Scheduling-PhysicalUplink Shared Channel (PUSCH)-HARQ timing of cross-carrier scheduling ofthe SCell, if the SCell is the DL subset of the PCell).

FIG. 5 illustrates a timing relationship between an uplink data channeltransmission of a UE and an acknowledgement channel transmission of aeNB when a DL subframe of an SCell is a DL subset of a PCell accordingto a third exemplary embodiment of the present invention.

Referring to FIG. 5, when the UL subframe of the SCell is aligned withthe UL subframe of the PCell, as shown in part 501, the HARQ timing ofthe corresponding UL follows the PCell timing. In contrast, when the ULsubframe of the SCell is not aligned with the UL subframe of the PCell,as shown in part 503, and when the Physical Downlink Control Channel(PDCCH) and Physical Hybrid-ARQ Indicator Channel (PHICH) for thecorresponding UL process can be transmitted in the PCell, the HARQtiming of the corresponding UL follows the SCell timing. This makes itpossible to use, when the UL subframe of the SCell is aligned with theUL subframe of the PCell, the resource of the PCell maximally using thePCell timing, to allow PCell DL transmission when PDCCH and PHICH forPUSCH of the SCell follows the SCell timing, and to follow the SCelltiming only when PHICH resource exists in the DL subframe. This alsomakes it possible to maximize the scheduling efficiency, when the ULsubframe of the SCell is not aligned with the UL subframe of the PCell,if it is imperative to follow the SCell because of no PCell timing tofollow, and if the PDCCH and PHICH transmission is possible atcorresponding timing. However, if the PDCCH and PHICH transmission isimpossible, scheduling is not performed.

4) Fourth Exemplary Embodiment

The fourth exemplary embodiment relates to the SCell timing of UE's ACKchannel corresponding to PDSCH in self-scheduling when the SCell isneither the DL subset nor the UL subset of the PCell (PDSCH-HARQ timingof self-scheduling of the SCell, if the SCell is not the DL subset northe UL subset of the PCell).

FIG. 6 illustrates an SCell timing relationship between a PDSCH and aUE's acknowledgement channel with self-scheduling when an SCell isneither a DL subset nor a UL subset of a PCell according to a fourthexemplary embodiment of the present invention.

Referring to FIG. 6, in a case of configurations 3-1, 2-3, and 2-4aggregations where the self-scheduling is performed in the SCell and, ifit follows the PCell, the DL subframe of the SCell not aligned with thePCell has no PCell timing and thus, scheduling cannot be performed.Otherwise, if it follows the SCell, it becomes impossible to transmitthe PDSCH of the SCell of which ACK channel has to be transmitted at thetiming of UL subframe of the SCell not aligned with the PCell.Accordingly, in the fourth exemplary embodiment, the PDSCH of the SCellis scheduled through the self-scheduling, and the ACK channelcorresponding to this follows the PDSCH-HARQ timing of the TDDconfiguration having the DL subframe super-set or UL subset that arecommon in the SCell and the PCell.

In a case of aggregation of carriers with configurations 1 and 3, asshown in parts 601 and 605, the configurations 4 and 5 are UL subset andDL super-set of the configurations 1 and 3. In this case, since thedownlink of the SCell is the subset of the configuration 4 and the ACKchannel transmission timing for this is aligned with the UL subset ofthe configuration 4, it becomes possible to transmit data throughself-scheduling in the DL subframe of all the SCell.

For example, it is possible to use the timings of the configuration 4 or5 for the combination of the configurations 3 and 1, configuration 5 forthe combination of the configurations 2 and 3, and configuration 5 forthe combination of the configurations 2 and 4. The exemplary cases ofusing the timings of configuration 5 in the SCell for combinations ofconfigurations 1 and 3, 2 and 3, and 2 and 4 can be used.

5) Fifth Exemplary Embodiment

The fifth exemplary embodiment relates to the PDSCH-HARQ timing of theSCell through the self-scheduling when the DL of the SCell is neitherthe subset of the PCell nor the UL subset.

FIG. 7 illustrates a PDSCH-HARQ timing relationship of an SCell withself-scheduling when the SCell is neither a DL subset nor a UL subset ofa PCell according to a fifth exemplary embodiment of the presentinvention.

The fifth exemplary embodiment is advantageous in that the downlinksubframes of all SCells can be scheduled in the same situation as thefourth exemplary embodiment. However, if the PCell has configuration 3and the SCell has the configuration 1, the ACK channel of the UE forsubframe 0 in the PCell is transmitted at the subframe 4 but in theSCell transmitted at the subframe 2, as shown in FIG. 6. In this case,since although the eNB scheduler instructs data transmissionssimultaneously, the ACK channels are received at different timings, andthus, if the retransmission occurs continuously, the delay between thetwo data transmissions increases, resulting in increase of schedulingcomplexity. In order to address this problem, the fifth exemplaryembodiment proposes a method for following the timing of the PCell whenthe DL subframe of the SCell is aligned with the PCell and following thePDSCH-HARQ timing of the configuration having the DL subframe super-setor UL subset that are common in the SCell and the PCell with theconfigurations aggregated when the DL subframe of the SCell is notaligned with the timing of the PCell. In this case, it is possible tosecure the advantage of the fourth exemplary embodiment in that all DLsubframes of the SCell can be scheduled and the advantage in that theHARQ timing ends at the same time.

Referring to FIG. 7, as shown in parts 701 and 703, when the carrierswith configurations 3 and 2 are aggregated, the DL super-set or ULsubset common in the PCell and the SCell follow configuration 5, and theSCell following the timing of the configuration 5 only in the part whereit is not DL-aligned with the PCell, as shown in parts 705 and 707. Inthis way, if the PCell uses configuration 3 and the SCell usesconfiguration 2, the ACK channels of the UE are transmitted in both thePCell and the SCell in timing order of scheduling.

6) Sixth Exemplary Embodiment

The sixth exemplary embodiment relates to the scheduling-PUSCH-HARQtiming through cross-carrier scheduling when the SCell is the DL subsetbut not the UL subset of the PCell.

FIG. 8 illustrates a scheduling-PUSCH-HARQ timing relationship withcross-carrier scheduling when an SCell is a DL subset but not a ULsubset of a PCell according to a sixth exemplary embodiment of thepresent invention.

Referring to FIG. 8, since the SCell and the PCell has no UL subset orDL subset relationship, the HARQ timing relationship for uplink datachannel transmission through cross-carrier scheduling can be used asfollows. If the UL subframe of the SCell is aligned with the UL subframeof the PCell, the HARQ timing of the SCell follows the timing of thePCell. Otherwise, if the UL subframe of the SCell is not aligned withthe UL subframe of the PCell, the UL HARQ timing through cross-carrierscheduling of the SCell follows the SCell or SCell's UL super-settiming. This is the method for the case where the PHICH transmissionresource is prepared in the PCell at the corresponding UL process timingor the ACK channel resource for E-PHICH other than PHICH of the relatedart is prepared.

As shown in FIG. 8, the carriers using configurations 2 and 4 can beaggregated. If the UL PUSCH transmission is performed with thecross-carrier scheduling and if the UL is aligned between the PCell andthe SCell as shown in part 801 of FIG. 8, it is possible to follow thetiming of the PCell. If the ACK channel and data channel transmissionare possible at the same timing with the PCell and if the UL is notaligned, as shown in part 803, it is possible to follow the thirdconfiguration or the SCell timing. This is because there can be asituation of no PHICH transmission resource in the PCell, as shown inpart 805, and the transmission is possible only when such resource isguaranteed or the ACK channel resource, such as E-PHICH different fromthe channel of the related art is guaranteed. Otherwise, thecorresponding UL process cannot be scheduled.

7) Seventh Exemplary Embodiment

The seventh exemplary embodiment relates to the PDSCH HARQ timing of theSCell with self-scheduling when the SCell is the UL subset of the PCell.

FIG. 9 illustrates a PDSCH HARQ timing relationship of an SCell withself-scheduling when the SCell is a UL subset of a PCell according to aseventh exemplary embodiment of the present invention.

Referring to FIG. 9, part 901 shows an example of following the timingof the SCell for the PDSCH HARQ timing of the SCell when the SCell isthe UL subset of the PCell and the self-scheduling is applied as in thefirst exemplary embodiment. This is advantageous in scheduling all theSCell downlink subframes but has a problem in that the scheduling timingof the PCell and the SCell mismatch the ACK channel timing.

In order to avoid this problem, it is applied to follow the PCell timingwhen the SCell is the UL subset of the PCell and the self-scheduling isused and the PDSCH HARQ timing of the SCell is aligned with the DLsubframe of the PCell and the SCell and follow the SCell timing when thePDSCH HARQ timing of the SCell is not aligned, as shown in part 903.

In this case, the ACK channel occurs at the same timing as thescheduling timing, as shown in part 903, and even in the case notaligned, as shown in part 905, the order of the ACK channelscorresponding to the data channels occurring before and after match withthe data channel occurrence order so as to avoid the increase of thescheduling complexity caused by the mismatch between the PCell and theSCell.

8) Eighth Exemplary Embodiment

The eighth exemplary embodiment relates to scheduling-PUSCH-HARQ timingwhen the SCell is a UL subset of the PCell and a Round Trip Time (RTT)of the PCell is not the period of 10 msec.

In the above-described first to seventh exemplary embodiments, the RTTof the PCell is maintained as 10 msec equal to the length of radio frameand thus, the cross-carrier scheduling can be applied even though theSCell has a configuration different from that of the PCell.

In the Long Term Evolution (LTE) system, however, the TDD configurations0 and 6 may have 70 msec and 60 msec, respectively, for supporting n+1HARQ processes with n UL subframes. Accordingly, the TDD configuration 0has total 6 UL subframes per 10 msec to handle total 7 UL HARQprocesses, as shown in 1401 of FIG. 10. In a case of TDD configuration6, total 5 UL subframes exist for handling total 7 UL HARQ processes.

FIG. 10 illustrates a UL HARQ for an RTT of 70 msec in a TDDconfiguration 0 according to an exemplary embodiment of the presentinvention.

Referring to FIG. 10, in the TDD configuration 0, the UL HARQ startingat the #2nd subframe performs transmission at the #4th subframe of thenext radio frame and performs retransmission at different frames before70 msec elapses since the initial transmission. Accordingly, when theSCell differs from the PCell in configuration, if the number of ULsubframes is less than that of the PCell, it is impossible to follow thePCell's transmission timings for all retransmission. This means that itis difficult to support scheduling completely if the RTT of the SCelldoes not match the RTT of the PCell when the RRT of the PCell is not 10mesec. Since the configuration 6 has the RTT of 60 msec, this is thecase.

In order to address this problem, the eighth exemplary embodiment isimplemented in such a way of setting the RTT of the SCell to 10 msecwhen the UL HARQ RTT of the PCell is not 10 msec and the cross-carrierscheduling is applied to UL subframe of the SCell. For example, it ispossible to follow the timing of the PCell as scheduling to PUSCH timingwhen the SCell is aligned in at least one of the subframes 2, 4, and 7with configuration 0, and also follow the timing of the PCell as PUSCHto PHICH timing. In a case of the 2nd and 7th subframes of the SCell,the scheduling is transmitted in the 5th and 1st subframe of the PCelland follows the timing when the Most Significant Bit (MSB) of UL indexis 1 in the PCell. In addition, the PHICH corresponding to the PUSCHtransmission is transmitted at the 5th and 1st subframes according tothe PCell timing such that the RTT of the SCell becomes 10 msec. In acase of 4th subframe of the SCell, the scheduling is transmitted at the0^(th) subframe of the PCell and the acknowledgement channelcorresponding to PUSCH is transmitted at 0^(th) subframe such that theRTT of the SCell becomes 10 msec.

In view of the UL HARQ of the PCell, the eNB performs different UL HARQscheduling at every radio frame for PUSCH transmission in the PCell atthe 0^(th) or 1st or 5th subframe, however, the eNB uses the same ULHARQ process at this time. The PHICH transmission timing is of anacknowledgement channel for the same UL HARQ at the same DL subframeindex in the SCell but acknowledgement channel corresponding todifferent UL HARQ process in the PCell. For example, the PUSCH-PHICHtiming of the SCell is acquired by cyclic shifting different PCell ULHARQ timing.

If the PHICH is received initially at the same timing as the PHICHtransmission timing of PHICH of the n^(th) UL HARQ of the PCell, thereception is performed at the same timing as the PHICH transmission of(n−1)^(th) UL HARQ in the next retransmission. If the PHICH is receivedinitially at the PHICH transmission timing of the n^(th) UL HARQ of thePCell, the reception is performed at the same timing as the PHICHtransmission of the (n−1)^(th) UL HARQ in the next retransmission. Inthis way, the cross-carrier scheduling can be applied by maintaining theSCell RTT as 10 msec even when the PCell RTT is not 10 msec. Thisprocess can be operated as described follows.

FIG. 11 illustrates a scheduling-PUSCH-HARQ timing relationship when anSCell is a UL subset of a PCell and the PCell RTT is not 10 msecaccording to an eighth exemplary embodiment of the present invention.

Referring to FIG. 11, if the PCell uses the configuration 0 as shown inpart 150 land the SCell uses the configuration 5 as shown in part 1503,the aligned UL subframe is #2. In this case, if the cross-carrierscheduling occurs at the #6th subframe in the PCell, as shown in part1505, the PUSCH transmission occurs after 6 or 7 subframes according tothe UL index. In the case of the SCell, it may be imperative to indicatein the UL grant that the PUSCH occurs after 6 subframes for maintainingthe RTT of 10 msec.

At this time, simultaneous PUSCH may occur at the subframe after 6thsubframe or at the 7th subframe according to the UL index of UL grantfor the PCell. Once the PUSCH has been transmitted at the subframe after6th subframe of the SCell, the PHICH is transmitted at the same time asthe PHICH transmission timing of the UL HARQ of the PCell in which thecorresponding UL PUSCH is transmitted, as denoted by reference number1507. In this case, the PHICH transmission timing matches differentPHICH transmission timing of the PCell UL HARQ at every time inretransmission, as denoted by reference number 1509.

FIG. 12 illustrates a scheduling-PUSCH-HARQ timing relationship when anSCell is a UL subset of a PCell and the PCell RTT is not 10 msecaccording to the eighth exemplary embodiment of the present invention.

Referring to FIG. 12, the PCell uses TDD configuration 0 while the SCelluses TDD configuration 3. The PCell operates with the configuration 0and RTT of 70 msec, as shown in part 1601, while the SCell operates withthe configuration 3, as shown in part 1603. The cross-carrier schedulingis performed in the same way of FIG. 11 at subframe #2 but, at thesubframe #4, the UL grant is transmitted at 0^(th) subframe, as shown inpart 1609, such that the PUSCH occurs after 4 subframes based on the ULindex. At this time, the acknowledgement channel transmission timingfollows the PCell timings as shown in FIG. 11 in a way of occurring atthe same time as the different UL HARQ PHICH transmission of the PCellso as to maintain the SCell RTT as 10 msec. Parts 1605, 1607, and 1611correspond to parts 1505, 1507, and 1509, respectively, of FIG. 11.

This exemplary embodiment is capable of performing the cross-carrierscheduling in the SCell by maintaining the SCell RTT as 10 msec withoutdefining new timing so as to make it possible to configure the PCellwith the TDD configuration 0.

9) Ninth Exemplary Embodiment

The ninth exemplary embodiment relates to the UL HARQ timing of theSCell in cross-carrier scheduling when the SCell is a UL subset of thePCell which is configured with the configuration 6 and RTT of 60 msec.

FIG. 13 illustrates an SCell UL HARQ timing relationship with across-carrier scheduling when the SCell is a UL subset of a PCell andthe PCell operates with configuration 6 according to a ninth exemplaryembodiment of the present invention.

Since total 6 UL HARQ processes perform transmission with 5 UL subframesin the TDD configuration 6, the RTT is 60 msec and, at this time, the ULsubframes are configured in unit of radio frame such that all UL HARQprocesses do not continue in the SCell when the SCell configuration is aUL subset.

FIG. 13 illustrates an exemplary case of the configuration 6 with 6 ULHARQ processes.

The different color lines indicate different UL HARQ processes. In theninth exemplary embodiment, the cross-carrier scheduling is performed insuch a way that the scheduling-PUSCH timing follows the timing of theconfiguration 1 and the PUSCH-HARQ timing follows the timing of thePCell when the UL subframes 2, 3, 4, and 6 are aligned with the SCell.This method is advantageous in that since the SCell maintains the RTT of10 msec, there is no mismatch of scheduling timing and acknowledgechannel transmission timing between the HARQ processes of the previousscheduling and current scheduling. In addition, there is no need todefine a new timing for scheduling.

Referring to FIG. 13, the PCell operates with configuration 6 as denotedby reference number 1701 while the SCell operates with configuration 1as denoted by reference number 1703. When transmitting the UL grant atthe 2nd subframe through cross-carrier scheduling, the PUSCH timingfollows the configuration 1 as denoted by reference number 1707 unlikethe PCell, and the PHICH transmission timing follows the timing of thePCell timing 1701 denoted by reference number 1705.

FIG. 14 is a flowchart illustrating an eNB procedure according to anexemplary embodiment of the present invention.

Referring to FIG. 14, the eNB is capable of transmitting the systeminformation to the UE in the PCell and the SCell at step 1001. This stepincludes transferring the system information including TDDconfigurations information for the PCell and the SCell that may beimperative for aggregation of carriers with different TDDconfigurations. The eNB determines whether to perform scheduling DL andUL data transmission at the current subframe at step 1003. Thecontroller responsible for scheduling determines the state of thecurrent subframe in association with the UL or the DL subset/sup-setrelationship of the PCell and the SCell configurations, whether thepositions of the current subframes and transmission directions of thePCell and the SCell match with each other, and whether the RTT of thePCell is 10 msec to transmit the timings proposed. In this manner, it ispossible to transmit the DL and the UL scheduling information to the UEusing self-scheduling and the UE using cross-carrier scheduling. At step1005, the eNB is capable of transmitting or receiving the data channelaccording to the timings determined at step 1003 according to the datachannel or ACK channel transmitted by the UE.

FIG. 15 is a flowchart illustrating a UE procedure according to anexemplary embodiment of the present invention.

Referring to FIG. 15, an eNB receives system information of the PCelland the SCell at step 1101. The system information received at step 1101includes TDD configurations applied to different carriers aggregated.The UE determines, at step 1103, the UL or DL subset/sup-setrelationship of the PCell and the SCell configurations, whether thepositions of the current subframes and transmission directions of thePCell and the SCell match with each other, whether the RTT of the PCellis 10 msec to transmit the timings proposed, and whether the UE operateswith self-scheduling and cross-carrier scheduling based on the receivedsystem information. The UE determines the scheduled downlink or ACKchannel of uplink or data channel transmission timing based on thedetermination result. The UE transmits the data channel or receiving theACK channel or scheduling information based on the timings determined atstep 1105.

FIG. 16 is a block diagram illustrating a configuration of an eNBaccording to an exemplary embodiment of the present invention.

Referring to FIG. 16, the eNB includes a controller 1201 for determiningTDD configurations of configured PCell and SCell andtransmission/reception timings of data channel and ACK channels, a PCellscheduler 1203 and an SCell scheduler 1205 that are responsible for thePCell and the SCell data channel and an ACK channeltransmission/reception according to the timings determined by thecontroller.

FIG. 17 is a block diagram illustrating a configuration of a UEaccording to an exemplary embodiment of the present invention.

Referring to FIG. 17, the UE apparatus includes a controller 1301 fordetermining the TDD configurations of the configured PCell and SCell,whether downlink and uplink of the subframes match between the PCell andthe SCell, and transmission/reception timings. The UE further includes adata transceiver 1303 for receiving and transmitting data channels basedon the timings determined by the controller 1301 and an ACK channeltransceiver 1305 for transmitting and receiving the ACK channel based onthe timings determined by the controller 1301.

Exemplary embodiments of the present invention propose data channel andacknowledge channel timings of the SCell for matching the schedulingtimings and ACK channel transmission timing as well as making itpossible to perform scheduling at all subframes in transmitting andreceiving data channel to and from the UE supporting different TDDconfigurations-enabled carrier aggregation. The proposed technology iscapable of utilizing the timings of the TDD configurations of therelated art without extra timing information.

Exemplary embodiments of the present invention relate to a method and anapparatus for transmitting uplink/downlink data on the carriers havingdifferent TDD configurations supporting both the self-scheduling andcross-carrier scheduling of the UE using carriers of different TDDconfigurations so as to transmit acknowledgement channels at the sametimings regardless of scheduled carriers.

Exemplary embodiments of the present invention relate to a method and anapparatus for transmitting uplink/downlink data on the carriers havingdifferent TDD configurations capable of utilizing the timings defined inthe TDD configuration of the related art without additional timinginformation.

Exemplary embodiments of the present invention are not limited to theaforesaid, and other effects not described herein will be clearlyunderstood by those skilled in the art from the descriptions below.

While the invention has been shown and described with reference tocertain exemplary embodiments thereof, it will be understood by thoseskilled in the art that various changes in form and details may be madetherein without departing from the spirit and scope of the invention asdefined by the appended claims and their equivalents.

What is claimed is:
 1. A method by a terminal in a wirelesscommunication system, the method comprising: receiving first uplink(UL)/downlink (DL) configuration information for a primary cell andsecond UL/DL configuration information for a secondary cell; receivingdata on a physical downlink shared channel (PDSCH) at a first subframeof the secondary cell from a base station; and transmitting a hybridautomatic repeat request-acknowledge (HARQ-ACK) corresponding to thereceived data at a second subframe to the base station, wherein areference timing of the HARQ-ACK is determined based on a UL/DLconfiguration 4, if the scheduling type for the terminal is a selfscheduling and the first UL/DL configuration for the primary cell is aUL/DL configuration 3 and the second UL/DL configuration for thesecondary cell is a UL/DL configuration
 1. 2. The method of claim 1,wherein the reference timing of the HARQ-ACK is determined based onwhether the terminal is configured to monitor a control channel for thesecondary cell in another serving cell, and a relationship between afirst UL/DL configuration and a second UL/DL configuration.
 3. Themethod of claim 2, wherein, if the terminal is configured to monitor thecontrol channel for the secondary cell in another cell, a schedulingtype of the terminal is cross carrier scheduling, and wherein, if theterminal is not configured to monitor the control channel for thesecondary cell in the other cell, the scheduling type of the terminal isthe self scheduling.
 4. The method of claim 1, wherein the referencetiming of the HARQ-ACK is determined based on whether UL subframes ofthe SCell is a subset of UL subframes of the PCell, or wherein thereference timing of the HARQ-ACK is determined based on whether DLsubframes of the PCell is a subset of DL subframes of the SCell.
 5. Themethod of claim 2, wherein the reference timing of the HARQ-ACK isdetermined based on the second UL/DL configuration for the secondarycell, if the terminal is not configured to monitor the control channelfor the secondary cell in another cell and UL subframes of the SCell isa subset of UL subframes of the PCell, or wherein the reference timingof the HARQ-ACK is determined based on the first UL/DL configuration forthe primary cell, if the terminal is configured to monitor the controlchannel for the secondary cell in another cell and UL subframes of theSCell is a subset of UL subframes of the PCell.
 6. The method of claim1, wherein, if the scheduling type for the terminal is the selfscheduling, the reference timing of the HARQ-ACK is determined based ona UL/DL configuration 5, if the UL/DL configuration for the primary cellis a UL/DL configuration 2 and the UL/DL configuration for the secondarycell is the UL/DL configuration 3, if the UL/DL configuration for theprimary cell is the UL/DL configuration 2 and the UL/DL configurationfor the secondary cell is the UL/DL configuration 4, or if the UL/DLconfiguration for the primary cell is the UL/DL configuration 3 and theUL/DL configuration for the secondary cell is the UL/DL configuration 2.7. A terminal in a wireless communication system, the terminalcomprising: a transceiver configured to transmit and receive a signal;and a controller configured to control to: receive a first uplink(UL)/downlink (DL) configuration information for a primary cell and asecond UL/DL configuration information for a secondary cell, receivedata on a physical downlink shared channel (PDSCH) at a first subframeof the secondary cell from a base station, and transmit a hybridautomatic repeat request-acknowledge (HARQ-ACK) corresponding to thereceived dataat a second subframe to the base station, wherein areference timing of the HARQ-ACK is determined based on a UL/DLconfiguration 4, if the scheduling type for the terminal is a selfscheduling and the first UL/DL configuration for the primary cell is aUL/DL configuration 3 and the second UL/DL configuration for thesecondary cell is a UL/DL configuration
 1. 8. The terminal of claim 7,wherein the reference timing of the HARQ-ACK is determined based onwhether the terminal is configured to monitor a control channel for thesecondary cell in another serving cell and a relationship between afirst UL/DL configuration and a second UL/DL configuration.
 9. Theterminal of claim 8, wherein, if the terminal is configured to monitorthe control channel for the secondary cell in another cell, a schedulingtype of the terminal is cross carrier scheduling, and wherein, if theterminal is not configured to monitor the control channel for thesecondary cell in the other cell, the scheduling type of the terminal isthe self scheduling.
 10. The terminal of claim 7, wherein the referencetiming of the HARQ-ACK is determined based on whether UL subframes ofthe SCell is a subset of UL subframes of the PCell, or wherein thereference timing of the HARQ-ACK is determined based on whether DLsubframes of the PCell is a subset of DL subframes of the SCell.
 11. Theterminal of claim 7, wherein the reference timing of the HARQ-ACK isdetermined based on the second UL/DL configuration for the secondarycell, if the terminal is not configured to monitor the control channelfor the secondary cell in another cell and the UL subframes of the SCellis a subset of UL subframes of the PCell, or wherein the referencetiming of the HARQ-ACK is determined based on the first UL/DLconfiguration for the primary cell, if the terminal is configured tomonitor the control channel for the secondary cell in another cell andthe UL subframes of the SCell is a subset of UL subframes of the PCell.12. The terminal of claim 7, wherein, if the scheduling type for theterminal is the self scheduling, the reference timing of the HARQ-ACK isdetermined based on a UL/DL configuration 5, if the UL/DL configurationfor the primary cell is a UL/DL configuration 2 and the UL/DLconfiguration for the secondary cell is the UL/DL configuration 3, ifthe UL/DL configuration for the primary cell is the UL/DL configuration2 and the UL/DL configuration for the secondary cell is the UL/DLconfiguration 4, or if the UL/DL configuration for the primary cell isthe UL/DL configuration 3 and the UL/DL configuration for the secondarycell is the UL/DL configuration
 2. 13. A method by a base station in awireless communication system, the method comprising: transmitting afirst uplink (UL)/downlink (DL) configuration information for a primarycell and a second UL/DL configuration information for a secondary cellto a terminal; transmitting data on a physical downlink shared channel(PDSCH) at a first subframe of the secondary cell to the terminal; andreceiving a hybrid automatic repeat request-acknowledge (HARQ-ACK)corresponding to the received data at a second subframe from theterminal, wherein a reference timing of the HARQ-ACK is determined basedon a UL/DL configuration 4, if the scheduling type for the terminal is aself scheduling and the first UL/DL configuration for the primary cellis a UL/DL configuration 3 and the second UL/DL configuration for thesecondary cell is a UL/DL configuration
 1. 14. The method of claim 13,wherein the reference timing of the HARQ-ACK is determined based onwhether the terminal is configured to monitor a control channel for thesecondary cell in another serving cell and a relationship between afirst UL/DL configuration and a second UL/DL configuration.
 15. Themethod of claim 14, wherein, if the terminal is configured to monitorthe control channel for the secondary cell in another cell, a schedulingtype of the terminal is cross carrier scheduling, and wherein, if theterminal is not configured to monitor the control channel for thesecondary cell in the other cell, the scheduling type of the terminal isthe self scheduling.
 16. The method of claim 13, wherein the referencetiming of the HARQ-ACK is determined based on whether UL subframes ofthe SCell is a subset of UL subframes of the PCell, or wherein thereference timing of the HARQ-ACK is determined based on whether DLsubframes of the PCell is a subset of DL subframes of the SCell.
 17. Themethod of claim 14, wherein the reference timing of the HARQ-ACK isdetermined based on the second UL/DL configuration for the secondarycell, if the terminal is not configured to monitor the control channelfor the secondary cell in another cell and UL subframes of the SCell isa subset of UL subframes of the PCell, or wherein the reference timingof the HARQ-ACK is determined based on the first UL/DL configuration forthe primary cell, if the terminal is configured to monitor the controlchannel for the secondary cell in another cell and UL subframes of theSCell is a subset of UL subframes of the PCell.
 18. The method of claim13, wherein, if the scheduling type for the terminal is the selfscheduling, the reference timing of the HARQ-ACK is determined based ona UL/DL configuration 5, if the UL/DL configuration for the primary cellis a UL/DL configuration 2 and the UL/DL configuration for the secondarycell is the UL/DL configuration 3, if the UL/DL configuration for theprimary cell is the UL/DL configuration 2 and the UL/DL configurationfor the secondary cell is the UL/DL configuration 4, or if the UL/DLconfiguration for the primary cell is the UL/DL configuration 3 and theUL/DL configuration for the secondary cell is the UL/DL configuration 2.19. A base station in a wireless communication system, the base stationcomprising: a transceiver configured to transmit and receive a signal;and a controller configured to control to: transmit a first uplink(UL)/downlink (DL) configuration information and a second UL/DLconfiguration information for a secondary cell to a terminal, transmitdata on a physical downlink shared channel (PDSCH) at a first subframeof the secondary cell to the terminal, and receive a hybrid automaticrepeat request-acknowledge (HARQ-ACK) corresponding to the received dataat a second subframe from the terminal, wherein a reference timing ofthe HARQ-ACK is determined based on a UL/DL configuration 4, if thescheduling type for the terminal is a self scheduling and the firstUL/DL configuration for the primary cell is a UL/DL configuration 3 andthe second UL/DL configuration for the secondary cell is a UL/DLconfiguration
 1. 20. The base station of claim 19, wherein the referencetiming of the HARQ-ACK is determined based on whether the terminal isconfigured to monitor the control channel for the secondary cell inanother serving cell and a relationship between a first UL/DLconfiguration and a second UL/DL configuration.
 21. The base station ofclaim 20, wherein, if the terminal is configured to monitor the controlchannel for the secondary cell in another cell, a scheduling type of theterminal is cross carrier scheduling, wherein, if the terminal is notconfigured to monitor the control channel for the secondary cell in theother cell, the scheduling type of the terminal is the self scheduling.22. The base station of claim 19, wherein the reference timing of theHARQ-ACK is based on determined whether UL subframes of the SCell is asubset of UL subframes of the PCell, or wherein the reference timing ofthe HARQ-ACK is based on determined whether DL subframes of the PCell isa subset of DL subframes of the SCell.
 23. The base station of claim 20,wherein the reference timing of the HARQ-ACK is determined based on thesecond UL/DL configuration for the secondary cell, if the terminal isnot configured to monitor the control channel for the secondary cell inanother cell and the UL subframes of the SCell is a subset of the ULsubframes of the PCell, or wherein the reference timing of the HARQ-ACKis determined based on the first UL/DL configuration for the primarycell, if the terminal is configured to monitor the control channel forthe secondary cell in another cell and the UL subframes of the SCell isa subset of the UL subframes of the PCell.
 24. The base station of claim19, wherein, if the scheduling type for the terminal is the selfscheduling, the reference timing of the HARQ-ACK is determined based ona UL/DL configuration 5, if the UL/DL configuration for the primary cellis a UL/DL configuration 2 and the UL/DL configuration for the secondarycell is the UL/DL configuration 3, if the UL/DL configuration for theprimary cell is the UL/DL configuration 2 and the UL/DL configurationfor the secondary cell is the UL/DL configuration 4, or if the UL/DLconfiguration for the primary cell is the UL/DL configuration 3 and theUL/DL configuration for the secondary cell is the UL/DL configuration 2.